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Start block collisions

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This commit is contained in:
Miloslav Ciz 2024-09-23 20:21:08 +02:00
parent c0aa81e79e
commit e068b02b9f
5 changed files with 159 additions and 11 deletions
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47
map.h
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@ -163,6 +163,13 @@ uint32_t LCR_mapBlockGetCoordNumber(const uint8_t block[LCR_BLOCK_SIZE])
((((uint32_t) block[3]) & 0x3) << 16);
}
uint32_t LCR_mapBlockCoordsToCoordNumber(uint8_t x, uint8_t y, uint8_t z)
{
uint8_t b[LCR_BLOCK_SIZE];
LCR_makeMapBlock(0,x,y,z,0,0,b);
return LCR_mapBlockGetCoordNumber(b);
}
uint8_t *LCR_getMapBlockAtCoordNumber(uint32_t coord)
{
// binary search the block:
@ -339,12 +346,44 @@ uint8_t LCR_mapLoad(const uint8_t *map)
}
/**
Gets a pointer to a map block of the currently loaded map at given
coordinates. If there is no block at given coordinates, 0 is returned.
Same as LCR_mapGetBlockAt, but allows to specify start and end block of the
of the search to make it faster.
*/
const uint8_t *LCR_mapGetBlockAt(uint8_t x, uint8_t y, uint8_t z)
int LCR_mapGetBlockAtFast(uint8_t x, uint8_t y, uint8_t z,
int start, int end)
{
return 0;
// binary search (the blocks are sorted)
uint32_t n = LCR_mapBlockCoordsToCoordNumber(x,y,z);
while (start <= end)
{
int m = (start + end) / 2;
uint32_t n2 = LCR_mapBlockGetCoordNumber(
LCR_currentMap.blocks + m * LCR_BLOCK_SIZE);
if (n2 < n)
start = m + 1;
else if (n2 > n)
end = m - 1;
else
return m;
}
return -1;
}
/**
Gets an index to a map block of the currently loaded map at given
coordinates. If there is no block at given coordinates, -1 is returned.
*/
int LCR_mapGetBlockAt(uint8_t x, uint8_t y, uint8_t z)
{
if (LCR_currentMap.blockCount == 0)
return -1;
return LCR_mapGetBlockAtFast(x,y,z,0,LCR_currentMap.blockCount - 1);
}
uint8_t _LCR_encodeMapBlockCoords(uint8_t x, uint8_t y, uint8_t z)